Calculator for determining heating and cooling requirements



R. E. JONES March 20, 1962 CALCULATOR FOR DETERMINING HEATING ANDCOOLING REQUIREMENTS Filed Oct. 21. 1958 2 Sheets-Sheet 1 ekwafill.

March 20, 1962 Q l O m N N N vauv ssv'le INVENTOR RAGON JONES Od/ Y M BYy ATTORNEYS States arent l aszaesl Patented Mar. 20, 1962 This inventionrelates to a calculator for determining the amount of heating andcooling needed for residential housing.

The residential air conditioning industry, which includes heating andcooling, is presently hampered by the costly and time consuming methodsused vinkestimating the sizes and capacities of heating and coolingunits needed for houses of various sizes and types of 'construction. Itis felt that the industry needs some means for accurately and quicklyestimating such requirements.

In view of the above, it is a principal object of this inventiontoprovide a calculator for determining the size of heating and coolingunits needed for residential housing of various sizes and diierent typesof construction.

It is another object to provide a calculator such as the above which isaccurate and `simple to use.

It is yet another object to provide a calculator as char-` acterized bythe above objects which is relatively inexpensive and easy tomanufacture.

It is a still further object to provide a calculator as in the precedingobjects which comprises a pair of cooperating slides carried within anenvelope having two window openings for exposing at least portions ofthe respective slides.

The above and other objects will become more apparent when taken inconjunction with the following detailed description and drawings,showing by way of example a preferred embodiment of this invention, andwherein:

FIG. 1 is a top plan view of the calculator showing the two slidescarried within the envelope and the two window openings exposingportions of therespective slides;

FIG. 2 is a plan view of a chart from which a value representing theratio of glass area to oor area is determined; and

FIG. 3 is a horizontal cross sectional view taken along line 3 3 of FIG.l.

As illustrated in FIGS. l and 3 the calculator 10 cornprises a frontsheet 12 and a back sheet 14 held in spaced relation by yend spacers16,-16 and top spacer 18 shown in dotted lines in FIG. 1. The front andback sheets together with the end and top spacers form an envelope 20having an open bottom slot indicated by arrow 22.

The front sheet 12 has a pair of rectangular windows 24 and 26. A scalerepresenting floor area of a house is positioned on the front sheet 12along the lower horizontal edge of the window 24. A pair of alignedslots 27-27 are formed in front and back sheets 12 and 14 respectively,adjacent and parallel to the vertical sides of window 24 toy provide apair of guideways 23, 28.

A pair of aligned slots 30-30 are cut in the front and back sheets 12and 14 parallel to the outward vertical side of the window 26 to form aguideway 32. A slot 34 is cut in the bottom sheet :14 parallel to slots30-30 to form a guideway 36 which is displaced inwardly of the inwardvertical side of window 26.

A slide l40 is slidably carried within the envelope 20. This slide isvretained in sliding alignment by means of pins 42, 42 carried in theslide and riding in guideways 28, 28. Slide 40 is generally rectangularin shape and includes a chart 44 adaptedto register with window 24. Thischart has plurality sloping lines having values derived yfrom the ratioof glass area to oor area of a given house. These sloping linesintersect the scale on the lower horizontal edge of the window 24. Suchintersection is controlled by the sliding back and forth of the slide40. In

addition one vertical edge portion of the slide 40 extends under window26. This edge portion has two index lines A and AA therein whichrepresent two basic types of houses, namely, A for one-story and AA fortwo-story.

A second slide 50 is slidably carried within the envelope 20 in coplanarrelation to the slide 40. This slide is retained in alignment by meansof pins 52, 52 in the slide which ride in guideways 32 and 36. Slide 50`is generally rectangular in shape and contains a plurality of Verticalscales. The tirst vertical scale, which is denoted by letters n theslide 50 has two main Vdivisions of scales one of onestory houses andthe other for two-story houses. f Each of these main divisions containstwo scales, one for heat- Y ing requirements and one for coolingrequirements. The scale for cooling requirements is divided into vecolumns, i.e., 10, 15, 18, 20, 25. These values are known as temperaturedifferences and are well known in the art.

The TD (temperature derence) depends on local conditions. Each cooling TD column has a scale representing tons of cooling capacity needed. Thesame arrangement is used in the heating scale, i.e., ve TD columnsnamely 55, 65, 75, 85, 95. Under each of these columns is a scaledevoted to heat requirements in B.t.u.s.

The lower horizontal edge of the Window 26 is the result line, being socalled because it is along this line that the values of the variousscales are read to determine heating and cooling requirements inaccordance with the setting of slides 40 and 50.

Referring to FIG. 2, there is shown a chart 60 havingV a plurality oflines sloping upwardly and slightly diverging from left to right. Thevertical scale represents glass area of a house, While the horizontalscale represents lloor area of the house. This chart is generally placedon the exposed face of the back sheet 14.

In using this calculator, the square feet of iloor space and glass mustVbe determined as well as the characteristics of the house such as, oneor two stories, type of construction, i.e. brick, frame, etc.,insulation if any, and also TD for heating and cooling in the particulararea involved.

The rst step is to refer to chart 60 shown in FIG. 2 and iind thesloping line which intersects the point of intersection yof the glassarea and floor area on this chart. For example, assume the line R passesthrough this point. Further, assume that the house is one-story, thefloor area being 2,400 square feet. Slide 40 is next adjusted so thatthe sloping line R will intersect the 2,400 square feet designation onthe scale on the lower horizontal edge of the window 24. Next, the slide50 is adjusted so that index line A on slide 50 will line up with line Aon slide 40. Now reference is made to the result line and to the propercolumns to determine heating and cooling requirements. For example,suppose the TD for cooling is 18 and heating is 55, then therequirements would be found at points P and Q respectively.

The advantages of a calculator such as this will be readily apparent topeople in the heating and cooling lield. In a matter of minutes anestimate can be made, upon which prices can be approximated. Such adevice is considered invaluable to estimators and salesmen in the eld.

Having thus described my invention and the best mode of practicing thesame, what I claim as novel and desire to secure by Letters Patent ofthe United States is:

l. A calculator for determining the heating and cooling requirements forhousing of various sizes and construction, said calculator comprising aholder, rst and second slides carried within said holder in coplanarrela- Vtion so that one vertical edge of each slide abuts the other, thefirst slide having a plurality of sloping lines representing valuesderived from the ratio of glass to floor; area, a scale on'the holderrepresenting floor area and adapted for alignment with said slopinglines to determine the position of the slide in the holder, said firstyslide having a pair of index lines on its vertical edge contacting theadjacent vertical edge on the second slide, said pair of index linesrepresenting two different types of houses, the second slide having afirst vertical scale representing various types of house constructionsand positioned adjacent the vertical edge contacting the vertical edgeof the iirst slide for alignment with one or the other of said indexlines, said second slide also having a plurality of vertical scalesrepresenting heating and cooling requirements for either one ortwo-story houses for various temperature difference designcharacteristics, and the holder having a result line cooperating Withtheplurality of vertical scales on said second slide whereby when thesecond slide is positioned with its -tirst vertical scale properlyaligned with the index'rnarks on the rst slide the heating and coolingrequirements for a specific house construction are read oil? theplurality of vertical scales where they intersect the result line'. a

y2. The calculator as described in claim l wherein the holder comprisesfront and back sheets held inspaced envelope having an open bottom.

3. The calculator as described in claim 2 wherein the front sheet of theholder has a pair of windows, the first `window having the iloor areascale positioned along its lower edge .for alignment withy the plurality,of sloping lines on the rst slide, and wherein the index lines on therst slide are exposed in the second Window, the second slide being sopositioned that all ofy the scales thereon Y relation by two end spacersand a top spacer to form an of oor space extending along the lowerhorizontal edge of the window, a pair of parallel slots in the front andback sheets parallel to the vertical edges of the window, a rectangularslide slidably positioned within the envelope beneath the rectangularwindow, said slide having a plurality of sloping lines thereonrepresenting the ratio of the glass area of a house to the floor area,and said slide being adapted for sliding so that the scale on the slidemay be aligned with the horizontal scale on the lower edge of therectangular opening, pins on the slide riding in the vertical slots inthe front and back sheets tocontrol the sliding movement of the slide,said slide having a pair of spaced index marks on one vertical edgeportion desig-l nating different types of houses, the front sheet havinga second rectangular window spaced from the irst window, that portion ofthe irst Slide having the index lines being exposed in the second windowadjacent the inward vertical edge thereof, aligned slots in the frontand back second slide the second slide having a Yfirst vertical scale 'yadjacentithevertical edge abutting the first slide, said second slidealso having a plurality of vertical scales representing heating andcooling requirements for-either one or two-story houses for varioustemperature diiierence design characteristics, the holder having aresult line cooperating with the plurality of vertical scales on saidVsecond slide whereby when the second slide is positioned with its firstvertical scale properly aligned with the index marks on the tirst slide,the heating and cooling requirements for a specific house constructionare read othe plurality of vertical scales where they intersect theresult line.

References Cited in the ille of this patent UNITED STATES PATENTS1,555,190 Currin Sept. 29, 19,25 1,957,112 Smith May l, 1934 2,385,452Lande a Sept. 25, 1945 Brickner Nov. 1,7, 1953

